Fixed #24858 -- Added support for get_FOO_display() to ArrayField and RangeFields.

_get_FIELD_display() crashed when Field.choices was unhashable.

tests/postgres_tests/test_ranges.py

@@ -7,6 +7,7 @@ from django.core import exceptions, serializers
 from django.db.models import DateField, DateTimeField, F, Func, Value
 from django.http import QueryDict
 from django.test import override_settings
+from django.test.utils import isolate_apps
 from django.utils import timezone
 
 from . import PostgreSQLSimpleTestCase, PostgreSQLTestCase
@@ -22,6 +23,30 @@ except ImportError:
     pass
 
 
+@isolate_apps('postgres_tests')
+class BasicTests(PostgreSQLSimpleTestCase):
+    def test_get_field_display(self):
+        class Model(PostgreSQLModel):
+            field = pg_fields.IntegerRangeField(
+                choices=[
+                    ['1-50', [((1, 25), '1-25'), ([26, 50], '26-50')]],
+                    ((51, 100), '51-100'),
+                ],
+            )
+
+        tests = (
+            ((1, 25), '1-25'),
+            ([26, 50], '26-50'),
+            ((51, 100), '51-100'),
+            ((1, 2), '(1, 2)'),
+            ([1, 2], '[1, 2]'),
+        )
+        for value, display in tests:
+            with self.subTest(value=value, display=display):
+                instance = Model(field=value)
+                self.assertEqual(instance.get_field_display(), display)
+
+
 class TestSaveLoad(PostgreSQLTestCase):
 
     def test_all_fields(self):